In the lanthanide series, the basicity of the lanthanide hydroxides :

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In the lanthanide series, the basicity of the lanthanide hydroxides :

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first increases and then decreases

decreases

increases

first decreases and then increases

answer is B.

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Detailed Solution

$Lu (OH)_{3}$ is the weakest base. Across the lanthanide series, the size of the cations decreases, resulting in a decrease in ionic character and an increase in covalent character of lanthanide hydroxides. As a result, the basicity of hydroxides decreases.

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